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Pneumatic tire and method for manufacturing the same

a technology of pneumatic tires and pneumatic reinforcement layers, which is applied in the field of pneumatic tires, can solve problems such as uniformity degradation of tires, and achieve the effects of reducing road noise at a high level, avoiding the defect of tire uniformity degrading caused by belt reinforcing layers, and enhancing high-speed durability

Active Publication Date: 2020-12-08
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a pneumatic tire with excellent noise reduction and durability without compromising uniformity. The tire has belt reinforcing layers that are embedded on the outer circumferential side of the belt layer and formed by winding spirally-like strip members in a tire circumferential direction. This design suppresses movement in the tire radial direction, reducing road noise and improving durability. The belt reinforcing layers are inclined in the same direction with respect to the tire circumferential direction, and the tire width direction gaps between them are roughly constant along the tire circumferential direction, avoiding the defect of tire uniformity degrading. The method for manufacturing the tire involves laminating the belt reinforcing layers on the outer circumferential side of the belt layer in a certain way, ensuring the formation of robust annular belt reinforcing layers.

Problems solved by technology

Due to this, a problem occurs in that the uniformity of the tire degrades.

Method used

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  • Pneumatic tire and method for manufacturing the same
  • Pneumatic tire and method for manufacturing the same
  • Pneumatic tire and method for manufacturing the same

Examples

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examples

[0041]Using two types of test tires (Working Example and Conventional Example), that is, pneumatic tires for a passenger vehicle having identical specifications where only an embedding specification of the belt reinforcing layers differed, Radial Force Variation (RFV) and Radial Run Out (RRO) were measured and the results thereof are shown in Table 1. In Table 1, measurement values of the Examples are indexed, a measurement value of the Conventional Example being a reference at 100. Smaller index numbers indicate superior uniformity of the tire.

[0042]As illustrated in FIG. 2, the tire width direction gaps S1 and S2 between the belt reinforcing layers of the Working Example were substantially the same along the tire circumferential direction. The longitudinal direction edges positioned at the center portion side of the tire width direction of the left and right strip members were set at substantially the same positions along the tire circumferential direction. As illustrated in FIG. ...

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Abstract

A pneumatic tire and a method for manufacturing the same are provided. In a step of laminating belt reinforcing layers on an outer circumferential side of a belt layer constituting a green tire, wherein the belt reinforcing layers cover each of a tire width direction left edge portion and right edge portion of the belt layer and are separated from each other in the tire width direction, each of the belt reinforcing layers is formed by inclining strip members constituting each of the reinforcing layers in a same direction with respect to a tire circumferential direction, and winding the strip members in a spiral-like manner at least one time around in the tire circumferential direction.

Description

TECHNICAL FIELD[0001]The present technology relates to a pneumatic tire and a method for manufacturing the same, and particularly relates to a pneumatic tire whereby road noise reduction performance and high-speed durability performance can be ensured at high levels without causing any degradation in uniformity, and a method for manufacturing the same.BACKGROUND ART[0002]Structures of pneumatic tires are known where a belt layer is disposed on an outer circumferential side of a carcass layer, and reinforcing layers are disposed so as to cover both tire width direction edge portions of the belt layer (e.g., see Japanese Unexamined Patent Application Publication No. 2009-56938). According to this tire structure, when traveling, movement in the tire radial direction of both of the tire width direction edge portions of the belt layer is suppressed by the belt reinforcing layers. Therefore, road noise can be reduced. Furthermore, high-speed durability of the tire can be enhanced. By disp...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B60C9/22B29D30/30B29D30/72B29D30/70
CPCB29D30/72B29D30/3028B29D30/70B60C9/2204B60C2009/2219
Inventor DOI, HIDEFUMIHIRANO, MASAHIRO
Owner YOKOHAMA RUBBER CO LTD
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